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1 package org.jaxen.util;
2
3
63
64 import org.jaxen.Navigator;
65 import org.jaxen.UnsupportedAxisException;
66 import org.jaxen.JaxenRuntimeException;
67
68 import java.util.Iterator  ;
69 import java.util.NoSuchElementException ;
70 import java.util.Stack ;
71
72 public class DescendantAxisIterator implements Iterator
73 {
74
75 private Stack stack = new Stack ();
76 private Iterator children;
77 private Navigator navigator;
78
79 public DescendantAxisIterator(Object contextNode,
80 Navigator navigator) throws UnsupportedAxisException
81 {
82 this(navigator, navigator.getChildAxisIterator(contextNode));
83 }
84
85 public DescendantAxisIterator(Navigator navigator,
86 Iterator iterator)
87 {
88 this.navigator = navigator;
89 this.children = iterator;
90 }
91
92 public boolean hasNext()
93 {
94 while (!children.hasNext())
95 {
96 if (stack.isEmpty())
97 {
98 return false;
99 }
100 children = (Iterator ) stack.pop();
101 }
102 return true;
103 }
104
105 public Object next()
106 {
107 try
108 {
109 if (hasNext())
110 {
111 Object node = children.next();
112 stack.push(children);
113 children = navigator.getChildAxisIterator(node);
114 return node;
115 }
116 throw new NoSuchElementException ();
117 }
118 catch (UnsupportedAxisException e)
119 {
120 throw new JaxenRuntimeException(e);
121 }
122 }
123
124 public void remove()
125 {
126 throw new UnsupportedOperationException ();
127 }
128
129 }
130 |
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